56553971 has 4 divisors (see below), whose sum is σ = 56572752. Its totient is φ = 56535192.

The previous prime is 56553961. The next prime is 56553977. The reversal of 56553971 is 17935565.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56553971 - 2⁶ = 56553907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56553977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3740 + ... + 11273.

It is an arithmetic number, because the mean of its divisors is an integer number (14143188).

Almost surely, 2^56553971 is an apocalyptic number.

56553971 is a deficient number, since it is larger than the sum of its proper divisors (18781).

56553971 is a wasteful number, since it uses less digits than its factorization.

56553971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18780.

The product of its digits is 141750, while the sum is 41.

The square root of 56553971 is about 7520.2374297624. The cubic root of 56553971 is about 383.8436569673.

The spelling of 56553971 in words is "fifty-six million, five hundred fifty-three thousand, nine hundred seventy-one".